If a musician wants to be an actor everyone thinks that's pretty cool. But if an actor wants to play a song even if they've been doing it for 40 years that's bad news.
Playing and singing at the same time is pretty cool but sometimes it's difficult to know when you can just really let go a bit because you've got to get back to bloody microphone and sing some stuff.
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Jazz took too much discipline. You have to come in at the right place which is different than me singing the blues where I can sing 'Oh baby ' if there's a pause in the melody. With jazz you better leave that space open or put in something real cool.